diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 3058ceafe2..a52289fb38 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -964,6 +964,14 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, return getSetCC(Result, LHS->getValueType(0), LL, LR); } } + + // and/or zext(a), zext(b) -> zext(and/or a, b) + if (N1.getOpcode() == ISD::ZERO_EXTEND && + N2.getOpcode() == ISD::ZERO_EXTEND && + N1.getOperand(0).getValueType() == N2.getOperand(0).getValueType()) + return getNode(ISD::ZERO_EXTEND, VT, + getNode(Opcode, N1.getOperand(0).getValueType(), + N1.getOperand(0), N2.getOperand(0))); break; case ISD::XOR: if (N1 == N2) return getConstant(0, VT); // xor X, Y -> 0 |